Top 250+ Solved Electromagnetic Theory MCQ Questions Answer
Q. A positive and a negative charge are initially 50 mm apart. When they are moved closetogether so that they are now only 10 mm apart, the force between them will be
a. 5 times smaller than before
b. 5 times greater than before
c. 10 times greater than before
d. 25 times larger than before
Q. Which is the most superior dielectric out of the following ?
a. Air
b. Glass
c. Bakelite
d. Paper
Q. When a dielectric is placed in an electric field the field strength
a. decreases
b. increases
c. reduces to zero
d. remain unchanged
Q. To prevent the generation of static charges on rubber or flat leather
a. surface is moistened
b. conductive dressing is done
c. oil compound dressing is done
d. talcum powder is sprayed on the surface
Q. Which of the following capacitor is preferred in case of single phase motor ?
a. Mica capacitor
b. Paper capacitor
c. Electrolytic capacitor
d. Ceramic capacitor
Q. A capacitance is a circuit component that opposes the change in circuit
a. current
b. voltage
c. impedance
d. none of the above
Q. A condenser suitable for D.C. only is
a. metallic plate variable gang condenser
b. metallic paper capacitor
c. oil impregrated paper condenser
d. poled aluminium electrolytic condenser
Q. In a capacitor, the electric charge is stored in
a. metal plates
b. dielectric
c. dielectric as well as metal plates
d. none of the above
Q. A permeable substance is one
a. which is a good conductor
b. which is a bad conductor
c. which is a strong magnet
d. through which the magnetic lines of force can pass very easily
Q. The materials having low retentivity are suitable for making
a. weak magnets
b. temporary magnets
c. permanent magnets
d. none of the above
Q. Air gap has_______eluctance as compared to iron or steel path
a. little
b. lower
c. higher
d. zero
Q. The direction of magnetic lines of force is
a. from south pole to north pole
b. from north pole to south pole
c. from one end of the magnet to another
d. none of the above